JPH0422223Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to instantaneous water heaters and other water heaters.

(Prior Art) Conventionally, a combustion chamber includes a heat exchanger and a gas burner device located below the heat exchanger, and the gas burner device has a combustion surface on the upper surface of the distribution chamber and a discharge port opening on the lower surface of the distribution chamber. It is known to include a fan, and to mix fuel gas and air from a gas nozzle facing the fan casing within the fan casing and supply the mixture into the distribution chamber.

(Problem to be solved by the invention) However, in this device, the gas burner device faces below the heat exchanger, and the gas burner device has a combustion plate on the top surface of the distribution chamber and a discharge port opening in the bottom surface of the distribution chamber. Since the heat exchanger is equipped with a fan, condensate generated in the heat exchanger flows into the fan casing of the fan and accumulates in the casing, causing problems such as corrosion of the casing. Therefore, it has been considered to provide a drain hole in the casing, but this has the disadvantage that gas leaks from the hole.

(Means for Solving the Problems) The present invention provides a water heater that is free from such inconveniences, and includes a heat exchanger and a gas burner device located below the heat exchanger in a combustion chamber. The method includes a fan having a combustion surface on the upper surface of the distribution chamber and a discharge port opened on the lower surface of the distribution chamber, and mixes fuel gas and air from a gas nozzle facing the fan casing of the fan to produce the distribution. In the fan casing that is supplied indoors, a negative pressure section is formed at the bottom of the fan casing, and a drain hole is provided in the negative pressure section.

(Function) In this case, even if the condensate generated in the heat exchanger flows into the fan casing of the fan, it flows out through the drain hole provided at the bottom of the fan casing, so that the condensate does not enter the fan casing. Furthermore, since the drain hole is formed in the negative pressure section, even if outside air flows into the fan casing through the drain hole, there is no problem of air-fuel mixture leaking to the outside.

(Example) An example of implementing the present invention will be explained with reference to the attached drawings.

In the drawing, 1 is a barrel-shaped combustion chamber provided in the water heater body 2, 3 is a heat exchanger facing into the combustion chamber 1, and 4 is a gas burner with a combustion surface 5 facing the bottom of the combustion chamber 1. The gas burner device 4 has a combustion plate, such as a ceramic plate, which covers substantially the entire bottom of the combustion chamber 1 and forms a combustion surface 5 on the upper surface of the distribution chamber 6.

A fan 8 equipped with a spiral fan casing 8a with a discharge port 7 opened faces the lower wall of the distribution chamber 6, and a gas nozzle 9 faces into the fan casing 8a of the fan 8.
The fuel gas and air from the gas nozzle 9 are mixed inside and supplied to the distribution chamber 6. In the drawings, reference numeral 6a indicates a distribution plate made of a perforated plate or the like provided in the distribution chamber 6. The configuration up to now is not particularly different from what is known in the past.

In the present invention, a negative pressure part 10 is formed at the bottom of the fan casing 8a, and a drain hole 11 is provided in the negative pressure part 10.This will be described in detail as shown in the figure. At the bottom of the fan casing 8a, there is provided a protrusion 12 having a wall surface that rises perpendicularly to the front surface in the direction of rotation of the runner 8b provided in the fan casing 8a, and a negative pressure section 10 is provided on the back surface of the protrusion 12.
A drain hole 11 was formed in the bottom surface of the drain hole. In the drawing, reference numeral 13 denotes an exhaust port provided at the upper front of the combustion chamber 1.

The gas nozzle 9 should be positioned so as to face the fan casing 8a as shown in FIG. 1, or as shown in FIG. A desired position is such that some or all of the fuel gas flows along the inside of the fan casing 8a.

(Effects of the invention) As described above, according to the present invention, a negative pressure part is formed at the bottom of the fan casing, and a drain hole is provided in the negative pressure part, which eliminates the inconvenience caused by drainage accumulating in the fan casing. In addition to being able to eliminate
By opening the drain hole in the negative pressure section, even if external air flows into the fan casing through the drain hole, the air-fuel mixture containing fuel gas will not flow out from the drain hole. do not have.

[Brief explanation of the drawing]

In the drawings, FIG. 1 is a cutaway front view of one example of implementing the present invention, and FIG. 2 is a cutaway front view of a modification thereof. DESCRIPTION OF SYMBOLS 1... Combustion chamber, 3... Heat exchanger, 5... Combustion surface, 6... Distribution chamber, 7... Discharge port, 8... Fan, 8a... Fan casing, 9... Gas nozzle, 10... Negative pressure section, 11... drain hole.

Claims (1)

[Scope of utility model registration request] The combustion chamber includes a heat exchanger and a gas burner device located below the heat exchanger, and the gas burner device includes a fan having a combustion surface on the upper surface of the distribution chamber and a discharge port opening on the lower surface of the distribution chamber. In the fan casing, a negative pressure section is formed at the bottom of the fan casing, and a drain is connected to the negative pressure section. A water heater with a hole.